<http://schema.org/description>
"Martian gullies were once hailed as evidence of liquid water on Mars. Now a new theory backed by experiment explains how they are formed by the flow of sand"^^<http://www.w3.org/2001/XMLSchema#string>
<https://www.technologyreview.com/s/418800/martian-gullies-were-formed-by-flow-of-sand/>